Is "markup" a noun or a verb? Do you "markup data" or "wrap data in tags"?

From: "Costello, Roger L." <costello@mitre.org>

To: <xml-dev@lists.xml.org>

Date: Fri, 12 Sep 2008 12:56:19 -0400

Hi Folks,
Consider this data:
Nikon D40
Here I did "something" to the data:
<camera>Nikon D40</camera>
Which is preferred way of expressing what I did to the data:
1. I marked up the data.
2. I wrapped the data in a tag.
3. I wrapped the data in tags.
4. I wrapped the data in a start-tag/end-tag pair.
5. I wrapped the data in markup.
6. I embedded the data in markup.
7. I enclosed the data in markup.
Or some other way?
I suspect that several of the above expressions are acceptable; which
ones?
Are some of the above expressions just plain wrong, i.e. incorrect
English grammar?
/Roger